I have a buddy interested in buying his first .45 semi-automatic, which will be used 95% home defense/5% target. He likes the feel of my Springfield XD, but I told him he should also check out the XDM. Other than the XDM having an interchangeable back strap or palm swell and a match grade barrel, is there anything else that is materially different? Is the XDM worth the extra $100 or so? Are there better options for a home defense weapon at about the same price? (I'm not a Glock fan, so I didn't go there)